Henry flad



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HENRY FLAI), OF. ST. LOUIS, MISSOURI.l

Letters Patent No. 94,732, dated September 14, 1869.

IMPROVEMENT IN HYDRAULIC ELEVATOR.

The Schedule referred tovin these Letters Patent and making part of the same.

To all whom it may concern:

, Be it known that I, HENRY FLAI), of St. Louis, in the county of- St. Louis, and State of Missouri, have made certain new and useful Improvements in Hydraulic Elevators and I do hereby declare that the `following is a full and clear description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.'

This invention relates to an improvement on an hydraulic elevator patented by Flad and Herthel, May 2S, 1867, and numbered 65,200., In the said patented elevator, a cylinder and piston were employed, n which the direct piessure of water from a street-main or other similar source was employed to operate the piston, and thus to raise the weight placed upon the elevator. These elevators, being principally designed for use in cities supplied'with water-pipes, the.. supply of water for the machine was to be taken therefrom. In the practical using of the said elevators, it is found that an occasional load, much larger than any ordinary load, had to be provided for in their constructima-and to do this, the dimensions of the cylinder had to be proportionately increased, thus not only add- Ving increased cost to the original construction of the machine, but also adding to the ruiming expenses, by using the same amount of water for small loads that was required for larger ones.

Itis to remedy these defects in the existing inachines that is the object ofthe present invention.

In the improved machine the cylinder is made just large enough for the ordinary loads, and a force-pump is added to the machine, for the purpose of supplying an extra amount of pressureon the piston whenever required, the usual pressure of the water from the main being taken advantage of in the construction of the machine, so as to employ it as an auxiliary to aid in the operation of the pump.

To enable those skilled in the art to make and use my improved elevator, I will proceed `to describe its construction and operation.

Figure l of the drawings is a sectional elevation of the complete elevator-hoist.

Figure 2 is a sectional elevation, showing the forcecylinder, and a side elevation of the auxiliary forcepump attachment.-d

In this machine, t-he cylinder A, sheaves a a', hoisting-rope B, and hoisting-platform C, are arranged precisely similar to what these, or the corresponding parts were in the former machine.

i In this machine, however, the cylinder is made somewhat smaller than those formerly employed,'aud beside it, and in connection with it, is placed the forcepump D.

Veration of the pump itself.

The street-main E is to be in connection with the cylinder A, and also with the pump D.

When small loads are to be raised, the direct pressure of the water iiom the main may be so applied toY the piston as to raisev it in the former manner; but when extraordinary loads are to be raised, the pump is to Vhe used in thc manner hereinafter described, to produce the extra pressure required.

The street-pipe, or main E may either have an in-- dependent attachment to the cylinder, or be conducted to it through the pump, lwith, a valve-arrangement so constructed as to deliver the water either to the pump or to the cylinder.

The pump used may be a double-action plungerpump, or a rotary-pump, or any other suitable pump, by means of whichthe direct pressure of the water from the supply-main may be used -to assist in the op- 'lhus, if a double-action plunger-pump be used, the pressure of the water on the rising plunger will be used to assist in depressing the forcing-plunger, and consequently only the additional pressure required in the cylinder will have `to be employed in the operation of the pump. If a singleaction pump were employed, a counterpoising weight would have to be used with it, so arranged as to allow the pressure from the main to be used to assist in raising the said weight at the receiving-stroke of the pump, andl then the weight itself might be used to assist in delivering the required amount of pressure to the cylinder. The same result would be obtained with the use of a rotary-pump, in which the pressure from its induction-pipe would be used to assist in its forward' motion.

Thus it will be seen that I do not limit myself to any particular form of pump, but the use of any form adapted to the purpose is clearly within the scope of my invention.

The pump may also be used to operate the elevator, when there may be no available pressure ou the fluid by which to operate it or the piston of the elevator, by taking the water or other fluid from a tank, or reservoir, or cistern, holding a little more than one cyliuder full.

- Having described my invention,

That I claim, is-

Ihe force-'pump D, when arranged to receive water under pressure and be actuated thereby, and by any auxiliary power, and reinforcing the pressure in the cylinder A, substantially as set forth.

HENRY FLAD.

Witnesses M. RANDoLrH, GEO. P. HERTHEL, Jr. 

